Abstract
Summary
Hemagglutination of monkey red cells was demonstrated with a concentrated measles tissue culture antigen. The antigen was destroyed by trypsin and its activity was significantly reduced by ether. Heat inactivation at 60°C for 10 minutes destroyed the infectivity, while hemagglutinating activity was significantly reduced only after one hour. A small non-infectious hemagglutinating unit was also demonstrated. Both hemagglutinating particles are antigenic and their activity was inhibited by specific antiserum. The small particles appeared during viral multiplication in the cell. Receptors on the red cells were of a different nature than those of myxoviruses.
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